JPS63196002A - Slide contactor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention applies to volume switches, potentiometers, and trimmers used for detection, control, setting, oscillators, etc. in measuring instruments, various machines, etc. (a type of variable resistor)
This paper relates to improvements to sliding contact devices used in, etc.

(Prior art and its problems) Sliding contact devices conventionally used in the above-mentioned volume switches, potentiometers, trimmers, etc. are made of carbon (C) or ruthenium oxide (RuOz) on a ceramic substrate.
), etc., to form a thick film resistance pattern, and a spring terminal material that can slide against the thick film resistance pattern of this wiring board, and an Ag contact material. This sliding contact device is constructed with a sliding contact made by caulking or welding, but this sliding contact device tends to generate noise (and has a somewhat high contact resistance (and is unstable due to some variation). It was easy to wear out, had a short lifespan, and had somewhat poor contact reliability.

For this reason, the part that slides with the sliding contact of the carbon or ruthenium oxide thick film resistor pattern on the ceramic substrate is
Either replace it with a u-resin conductor paste and cure it, or add Cu to the part that slides with the sliding contact of the thick film resistor pattern.
- Contact reliability is improved by layering and curing resin-based conductor paste, and the Ag contact material of the sliding contact is replaced with 30 to 50-t% Ag-Pd to prevent sulfurization.

However, the contact material with A g -P d 30 to 50 wt% is too hard at Hv 160 to 200, whereas the thick film conductor pattern, which is a cured product of Cu-resin conductor paste, is soft, resulting in increased wear. It reaches the end of its lifespan early.

Furthermore, since the Ag-Pd 30-50 wt% contact material has a low electrical conductivity (<lAC33,8-5.5), it has problems such as heat generation.

(Object of the Invention) An object of the present invention is to provide a sliding contact device that can solve the above problems.

(Means for Solving the Problems) A sliding contact device of the present invention for solving the above-mentioned problems includes forming a thick film resistance pattern by hardening a resistance paste on a ceramic substrate, and forming a thick film resistance pattern on a ceramic substrate. A wiring board formed by firing a Cu-resin conductor paste to form a thick film conductor pattern connected to a resistor pattern, and an Ag- It is characterized by comprising a contact material containing 6 to 124% tin oxide and a sliding contact formed by attaching a contact material to a spring terminal material.

In the sliding contact device of the present invention, the contact material of the sliding contact is A
The reason why the g-tin oxide content is 6 to 12 wt% is that if the tin oxide content in Ag is less than 6 wt%, the lubricating effect will be weak, and the sliding contact will not come into contact with the Cu-resin thick film conductor pattern on the ceramic substrate. This is because adhesion and peeling occur, and if it exceeds 12-t%, it becomes a cause of noise generation.

(Function) In the sliding contact device configured as described above, in the contact action between the sliding contact and the thick film conductor pattern on the ceramic substrate, the hardness of the Ag-tin oxide contact material of the sliding contact of 6 to 12 vt% Hv 110 ~150) is soft and slippery, so the contact resistance is low and stable, and the Cu-resin thick film conductor pattern is not damaged, and adhesion and peeling are almost eliminated, reducing wear. Good contact can be obtained. Furthermore, since the electrical conductivity of the Ag-tin oxide 6-12-t% contact material of the sliding contact is as good as 370-80% lAC, no heat is generated.

(Example) To explain an example of the sliding contact device of the present invention, as shown in the figure, Aj! with a plate thickness of 0.6 mm, a diameter of 30 m, and a purity of 98%! !
03 A RuQ resistor paste with a width of 3 squares is screen printed on the outer periphery of the substrate 1, and baked at 800°C to form a thick film resistor pattern 2 with a thickness of lOμ.
Connected to the , a Cu-resin conductor paste was screen printed in the circumferential direction, cured at 130℃, and a thick film with a width of 0.2 cranes, a length of 7 dragons, and a thickness of 10 μ was formed at 0.2 ring intervals. A conductive pattern (Cu-resin 26 wt%) 3 was formed to obtain a wiring board 4. On the other hand, the two types of sliding contacts 5, which are made to slide oppositely to the thick film conductor pattern 3 of this wiring board 4, are made of Ag.
-7.2wt% of tin oxide and 9.3wt% of Ag-tin oxide
- Two types of contact wires containing 0.1 wt% nickel oxide (diameter 1
, 5M) with a head diameter of 3mm and a head thickness of 0.
Two types of rivet contacts 6 with 6fi, leg diameters of 1 and 5 mm, and leg length of 1.5 m were each made of B with a width of 4 mm and a thickness of 0.15 m.
It is inserted into a contact mounting hole of a spring terminal material 7 made of e-Cu and is fastened.

The sliding contact device of Example 1.2 configured in this way,
A sliding opening/closing test was conducted under the following test conditions using a conventional sliding contact device consisting of a sliding contact having a 30wt% contact material and facing a thick film conductor pattern made of Cu-resin on a wiring board. However, we obtained the results shown in the table below.

Test conditions Contact crab 10g, action 2 rotation reciprocating type (55 degrees), drive:
60 strokes/win, energization: 12■, 100mA [As is clear from the table above, the sliding contact single point device of Example 1.2 has almost double the lifespan compared to the conventional sliding device. I can see that you are doing it. This is because the hardness of the Ag-tin oxide 6-12wt% contact material of the sliding contact 5 is soft and slippery, so the opposing Cu-resin thick film conductor pattern 3 will not be damaged and will not adhere or peel. This is because the electrical conductivity of the Ag-tin oxide contact material of 6 to 12 wt% is good and no heat is generated.

Note that the above-mentioned lifespan is due to wear of the thick film conductor pattern 3.
The evaluation was made based on the case where the sliding contact 5 came into contact with the Altos substrate and became an open state B (infinite contact resistance), and the case where a short circuit occurred due to clogging of the slit between the thick film conductor patterns 3.

Although the wiring board 4 of the sliding contact device in the above embodiment is circular, it may also be rectangular. In that case, the thick film resistor pattern is preferably formed on one side end of the rectangular wiring board, and the thick film conductor patterns are preferably connected to the thick film resistor pattern and formed in parallel at regular intervals in the longitudinal direction thereof. The sliding contact is slidable in the longitudinal direction of the thick film resistor pattern, facing the thick film conductor pattern. In addition, a thick film resistor pattern is formed on a ceramic substrate in a bellows shape and reciprocated back and forth, and a wiring board is formed on which thick film conductor patterns are arranged at regular intervals, and the wiring board faces the thick film conductor pattern. It is also possible to use a sliding contact device consisting of a sliding contact that is slidable.

Furthermore, as in Example 2, a portion of tin oxide is added to 0.01 to 1
It may be replaced with an oxide of an iron group element within a wt% range.

(Effects of the Invention) As can be seen from the above explanation, the sliding contact device of the present invention has a hardness of 6 to 12 wt% of Ag-tin oxide in the sliding contact.
O~150) is soft and slippery, so the Cu-resin thick film conductor pattern on the ceramic substrate will not be worn out during contact action, and there will be almost no adhesion or peeling, reducing wear. You can get good contact.

Therefore, the contact reliability is improved and the life of the sliding contact device is significantly extended. Furthermore, Ag-tin oxide 6-12 of the sliding contact
-t% Since the electrical conductivity of the contact material is good, no heat is generated during the contact action, and welding is less likely to occur.Therefore, the welding resistance of the sliding contact device is significantly improved.

[Brief explanation of the drawing]

The figure is a schematic perspective view showing an embodiment of the sliding contact device of the present invention. Applicant: Tanaka Kikinzoku Kogyo Co., Ltd. 7... Suason 7" Sako 7

Claims (1)

[Claims] A wiring board formed by firing a resistor paste to form a thick film resistor pattern on a ceramic substrate, and connecting the thick film resistor pattern to harden a Cu-resin conductor paste to form a thick film conductor pattern. , and a sliding contact formed by attaching a contact material of 6 to 12 wt % Ag-tin oxide to a spring terminal material so as to be able to slide against the thick film conductor pattern of this wiring board. Features a sliding contact device.